Letter-feed-controlled rebound lock



.lume 3o, 1925.

F. P. GORIN LETTER FEED coNTRoLLED REBOUND LocK Filed Sept. 1'7, 1920 5 Sheets-Sheet l e flier-Mcm) June 30, 1925.

F, P. GoRlN LETTER FEED CONTROLLED REBOUND LOCK Filed Sept. 17, 1920 @Nunca F. P. GORIN -LETTER FEED CONTROLLED REBOUND LOCK June 30, 1.925.

l 3 Sheets-Sheet 5 Filed Sept'. 17, 1920 Patented June 30, 1925.

orarai):l grim-ias@ FRED i?. f Gouin, on SEAIMLEVWASHINGTON;

,temeewseneomnormn mecum): LOCK. n

y Application ledtseptember 17:;"1920: islrrizal No. 41103837'.

Seattle,--in the county ofv King and Sta-teof' lVasl-iington; have invented l certain A new and useful Improvementsin Letter-Feed-Cone trolled Rebound Locksyof which the follow ing is a specification.

This invention relates generally toi im'- provements in tabulating tyii'ewriter` machilies, and articular-ly toa reboundloc-k niechanisinv for the' carriage of`l such ma`` chines.

ln controlling the *rebound locliV of' tabu; latin g typewriter machines, it is`higlily'imf p ortant'tliat thev returnof the rebou'ncllocl to inoperative' 'position be2 distinctly and positivelyseparated, inlpoint o'ftime; from the instant-of'rebound'ofthe carriage; that is to say. that when tlieJ carriage'hasL moved onfpasttlie writing point againstftlie action of itsbuffer spring, followingtheengage'- n'ient of the tabulator'stopsg, andhasbe'en returned to the writing' pointby the buffer spring, the rebound lock` at suoli instant mustlbe iii-operative position to prevent the carriage continuing' pastf the writi1`ig` point'. Furthermore the rebound'locl at Asuch instanti-must remain' absolutely motionless in operativeApositi-on untilthe shoclroflthe oar= riage andfrebound lo'elf impacthassubsided, and the' carriage movedto-engage its-'letter feed mechanism: In rebonnd lock `1nechanisins asfheretoforeprovided, there kiskconst'ant liability of anfinaccurate.positioning oftlie carriage, incidentl tothe, operator re moving his finger pressure from the't'abulatori liey beforefthe' carriage'hasL-been fully returned to the writing point; This dropping oil of the carriage `ha'sebee'n heretofore.' provided? against, as for example in Patent 11124219, January 5,- 1915, nflherein the tabw later 'is locked in* operative position during the action: off the buffer spring', andi in' a co-pending application filed by me'J'ully 24?, 1919, Serial BT05312986, wliereinitlierebound locli'-` members are fi-ict'ioned` against* each other to preventr complete unlocking# until are-` somewhat objectionable for` commercial reasons, and? therefore the presenti invention,-

wliicli obviatesA the necessityof eitherl look-y ing the tabu'lator in operative position, or'V depending upo'n friction, ifs designed to' `provide construction wherein the rebound 'loch is caused to return to normal for unlock position directly by an'dfas-'a-result' ofthe action o'fl` theI typewriter-letter feedniechanism;

The present` inv-enti'oninay be" generally stated as providing means for` holding the rebound lochV inoperative position until the shock of-'tlie rebound is# absorbed; andin utilizingthe' movement of the carriage toa position to cause cooperation ofthe letter feed'meclianism, as -is lusual following atabin lating movement, to positively release the. re-` bound loclr. The construction includes c'o' operating elements, which positively-` hold the carriageout of letter feed position during the action ofthe buffer spring, to automatically prevent any dropping off of the carriage' at other than the writing point.

In `the drawings Fig.- 1 is aplan view of a portion of a tabulating typewriter machine, showing the improved mechanism applied thereto.

Fig. 2 is a rear elevation of the same.

Fig. 3 isa sectionv online 3 3 of Fig. 1, the cooperating parts forming the invention being shown in unlock or inoperativepositions. y

Fig. 4 is a similar view with the parts in locked or operative positions.

Fig. 5 is an enlarged fragmentary view in plan showing the tooth blad'e'and connected parts in the positions occupied when the lock is in an unlocked or inoperative position.

Fig. 6 is a similar view showingthe positions of the parts when the lock is in an operative position.

7 is a similar view with thepartsin the positions occupied when the butler springhas returnedithe carriage to the writ-v ing point and immediately preceding the' unlocking or release of the rebound lock. Fig. 8 is an enlarged'detail in plan showing particularly the mounting of the parts directly forming' the rebound lock.

In the drawings `l represents a typewriter carriage and 2 the frame structure, generally. `Brackets 3' are secured to the car'- riage'andlsupport` pivot bolts 4;,.01'1 which is pivotally supported an extension 5, carrying the usual letter feed rack 6 arrangedfto engage the usual pinion 7. The carriage is operated in letter feed direction by the usual tape 8, attached atV one end as 9 to the car-V riageand connected at the opposite end to the usual spring drum 10." An ordinary tabulator stop bar 11, notched atl2 to adjustably receive the ordinary tabulator stops 13, is slidably mounted in channel blocks 14, which are secured to set screws l5 inchannels 16 in the brackets 3. The stop' bar isadapted to slide freely thru the ychannels in the blocks 14, and by means of the adjusting screws, these blocks may be obviously so relatively adjusted as to. insure the desirable free sliding action of the'stop bar without binding. Bearing blocks 17 are secured to the respective ends ofthe stop bar, and between one of said blocks and the adjacent .bracket 3 is arrangedthe carriage buffer spring 18.` The opposite block 17 carries a stop 19 adjustable therein, and` adapt-v ed .t0 abut the adjacent carriage bracket 3,

to act as a-limit for the'movement of the stop barwith respect lto the carriage.

A rod 20 is secured in the bearing blocks manner to cooperateJ with the stops 13 in the tabulating operation. vA bed plate 26 is removably secured'upon the top of the hous- Y ing 25, and Vhas one of its ends upturned as at 27, Fig. 8. Guide plates 28 are arranged upon the bed plate, and a bit plate 29 is arranged upon thebed plate between the guide plates.f The bit plate is adapted for. movement transverse the bed plate, which movement between and relative to the guide plates is facilitated by ballV bearings 30 between thebit plate and guide plates. The bit plate is held by a screw 31 taking into the bed plate, .with the screw receiving opening in the bit glate somewhat enlarged to permit the necessary movement ofsuc-h bit plate. The guide plate 23ne2 t theuip-V turned edge 27 of the bed plate is secured by screws arranged to permit a slight movement` of such guide plate, undei1 the action of adjusting screws 34 threaded thru the upturnededge 27, whereby to adjust the bearing action of the bit plate and insure a smooth even movement thereof.A

A resetting plate/35 is arranged in .slid-V able contact with the under surface of the toothed pla-te 22, saidplates 22 and 35V being connected thru themedium of screws mounted in the plate 35 projecting thru slots 37 in the toothed plate 22.. `The slots 37 in the plate or locking strip. 22 `are Vformed at one end with a lateral enlarge-Y ranged in said-enlargement, as in Fig. `5, the

unbroken edge of the resetting plate 35 will project slightly beyond the free ends of the teeth 23, and thereby prevent any locking cooperation with said teeth. The bit plate 29 is extended at 40 beneath the resetting plate, and Ais provided with one or more upstanding pins 41 on which are mounted rollers 42 to engage in a channel 43 formed in the underside of the resetting plate. The channel 43 extends longitudinally of` the resetting plate and thruout the length there of. A locking bit `44shaped to cooperate with the teeth 23 of thelocking strip 1s rigidlysecured on the bit plate29. j .i

An arm 45 is securedV to thefeed rack 6, the free end of this arm normally lies upon the stop bar and against one edge of a block 46 secured on said bar. Resetting arms 47 project from the resetting plate 35 with their free terminals in the path of push bars V48secured to the. feed rack 6 j Ina tabulating operation the feed rack 6 is raised from cooperation with thepinion 7, as isusual when a tabulator key is operated, and the arm 45 is, as a result of this movement, lifted from engagement fromlt-he block 46, and the carriage moved in the letter feed direction. When the ,projected-tabulator plunger 24 engages thestop 13, the Vmovement of the stop bar l1 is-of course suddenly arrested at the desired writing point.V The carriage however, under its inertiaA moves onward beyond the writing point against the action of the buffer s ring 18. ,The carriage in this further trave carries with it the resetting'plate 35, as the latter is connected tothe carriage thru an arm 49 secured to one of the brackets l3 and seating in a notch 50 in the edge of said resetting plate. As the resetting plate -moves with the carriage beyond the Writing point, the pins 36 ride out of the enlargements 38 ofthe slot 37.' In the` initial movement of these `pins,their travel, and consequently the travelfof the resetting plate is transverse the locking strip 22to` thereby withdraw the free edge of the resetting plate from blocking cooperation with the teeth 23of the locking strip 22. This movement of, the `pins is caused by the cam` edge 39Y ofthe slot enlargement 38.

In'this initial lateral movement ofthe resetting plate, the bit plate is moved toward the locking strip, owing to the;` connection` ofthe roller 42 in the slot 43 of said resetting plate, and the bit 44 is` forced into theproper. tooth 23 of the locking, `strip, to lock the parts. VOf course this locking a'ction'takes place" exactly atthe Writing point as dete'rn'iinedY by the! -tabulator stop. The carriage however continu-es', beyond such-point against the tension ofv the spring 18, the n'i'ovement4 of the resetting plate beperm'itted thru' the' free movement of the pins 36 in the slots B7. At the limit of compression `action on the buffery spring, the relative' parts Will be" substantially in the positions-.indicated in'Fig. 6 of the drawings. The carriage now starts to return tovvardthe Writing' point'y under the action offthebufler spring 18; moving the resetting"platetoyvardthe enlargement 38 of the slot', until aft the Writing point the pins 36 Wil-lf engageV the end-walls of the; slots defining such enlargement. This contact ab- .soi-bs the slight impact shock of the rebound andJ arrests the carriage against farther travelbey'ondthe Writing' point. This im# pact or shock is renderedvery slight because the'v` return movement of the carriage under the' influence of the buffer spring 18 is accomplished against the balancing influenceof the'spring [drum l0, which can of'icurse be tensioned, so asto just permit the' full return of the carriagetothe'writingpoint during an' averagerun of the' calf? riag, thev rebound lo'clrA acting -to` prevent rebound in case `of unusually long runsof the carriage.` 'During' the movement described, the arm 45 has beenriding on the upper surface of the block 46, andhence the carriage cannotreturn to a' position to permitv thetfeed rack 6to engage the pinion 7, until such arm 45 rides pastA the edge of the block, whichV occursobviously at "the 'tvriting point at AWhich the carriage has beenar'rested by'contactof the pins 36 with the Walls of theslot. Furthermore in the movement of thecarriage described in lifting the feed rack 6 from the pinion 7, the upper ends of the bars 48`are moved outwardly from the ends ofthe resetting arms 47, These arms ,47 are moved outwardly toward the push ba`rs48 inthe lateral movement o f theres'etting plate when the pins 36 rideloutr of the enlargementsV 38 of the slots 37 for the initial locking operationi When the carriage is completely arrested atthe Writing point, in Ythe manner and thru the mechanism i described, pins 36 of the resetting plate Will be inline with the enlargements 38 of the slots' of thejloclin'g strip, but at` the ends of the slots proper rather than in eijilargements, that is in the positions shown in Fig;` 7'. As the `arm 45 ridesofll the blockv 46, lthe feedraclr- 6 Will move toward a cooperative engagement KWith the pinion 7, andinthis'movement the pushbars 48Will engage the ends of the-resettingbarsv 47 and move the resettingv plate toi its nori'afial"` position, the pinsf86 movingl into' thel enlargements 38Mof, the slots-37.

Thisrhoviera" of the resetting" platenieves,l

the bit' plate to its normal position thru theconnection 42, thus forcing the-bit- 44 from the teeth 3 of the locking strip, and freeing the reboundlock.-

From the above description it will be aplpa'rentthat the rebound lock isf caused to returnto its normal-position as andby the coaction of? the typewriter' letter feed mechanism, as unless such letter feedis returned to normal position, the reboundlock is not released, Furthermore as the arm-45 rides upon the surface of the' block 46 during the action ofthe rebound locl'mechanism,

itisa'p'parent that the typewriter feed rack is automatically held out of engagement with its feed'pinionuntil the partsare in mechanism,'it is to be understood that' the invention Withinthe scope' outlined' by the claims is designed and contemplated for application to any tabulating mechanism, and that the application herein to the typewriter is merely illustrative of ythe use oftheinL vention with tabulating mechanism.

lVhat I claim i's':-

l, A typewriting machine having tabulating mechanism, a carriagebuffer, a rebound lclr, and means' operative through the re-engagementofthe carriage'letter feed to releasethe'rebound lock. i

2; A" typewriting machine havingl tabulatingy mechanism, a carriage buffer, a rebound locl automatically set in a tabulatiiig operation, Aand means operated by the moveinent of thecariiage letter feedme'clianism toward re-engagement following a tabulating operation to release the'reboundlock'.

3. VA typeWriting machine having tabu-v lating mechanism, a carriage buffer, a rebound lock, and means operated by the reengagen'i'jentl of' the carriage letter feed mechanism following` a tabulatin'g operation to release andlioldtout the rebo-und'lock.

4; In a typewriting machine', tabulating .inechanisnn a. rebound lock automatically set at the Writing point asdetermi'ned by such tabulating mechanism, means controlled by thel re-engagement of the letter feed for releasing saidy rebound lock, and

ineans'for-preventing such refengageinent of theJlet-tfer feed until the carriage movement is arrested. f

5. A typeWriting machine having tabullO lating mechanism, a rebound lock for the carriage automatically set. thru movement of the carriage beyond the writing point determined by the tabulating operation, and means actuated thru the return of the carriageV letter feed to normal position following a complete Varresting of the carriage movement for directly actuating the rebound lock to release the carriage. Y y

6. The combination with a typewriting machine, ofntabulating mechanism, a car riage buffer, a rebound lock, and means directly operated by ,the return of the typewriter letter feed to a rfc-engaged position for releasing the rebound lock;

7. The combinationwith a typewriting machine, o f tabulating mechanism, including stops which collide to arrest the ucarriage, a buffer to absorb'the shock ofsuch arrest, a rebound lock actuated in such tabulating movementto predetermine the final position ofthe carriage, and means to engage and release said rebound lock following the movement of the carriage to such final position, said means being operated by the return of the typewriter feed mechanism to re-engaged position.

8. The combination with aV typewriting` machine, of. tabulating mechanism, including stops which collide to arrest the carriage, a buffer which absorbs theshock incident to such arrest, a'rebound lock, and'connections between VKthe loclrand carriage which causes the lock to assume operative position atA the instant of such arrest and tov-remain in such position until `after the carriage is entirely free of all movement following the tabulating operation. f

9. The combination with a typewriting machine of tabulator mechanism including stops which collide with each other to arrest the carriage, a buffer which absorbs the shock incident to such arrest, a rebound lock and connections between the same and the carriage which causes the lock to become operative when the carriage is arrested, and connections between the typewriter letter feed and the lock which causes the lock to become inoperative in the return of the typewriter letter feed parts to normal position. Y i

10. The combinationwith a typewriting machine including a movable ,carriage and motor mechanism, of tabulator mechanism including stops which collide with each other to arrest the carriage, a bufferl which absorbs the shock of such arrest, a rebound lock and connections between the same and the carriage which causes the lock to become operative whenthe carriage is arrested during a tabulator operation, a member for operating the lock to release the same, and means *operatedV by 'the `typewriter letter feed in its return to normal position to actuate said member.

11.' The combination with a typewriting machineincluding a frame, a carriage mov-` able thereon, motor mechanism for the carriage and step bystep letter feed, ofl tabu.-k larting mechanism including stops on the frame and the carriagerespectively which collide with each other to arrest the carv riage, a buffer which absorbsthe shock yof such arrest, a rebound lock and connections between the sameand the carriage which causes the lock to become Voperative when the carriage is. so arresteda member moved in the operative movement of the lockrto a position to be actuatedl by the typewriter letter feed in its returnto normal position, and means carried by said typewriter-.letter feed to operate said member.

12. The combination with a` typewriting machine including a frame, a carriage mov-.K able thereon, motormechanism for the carriage andstep by step letter feed, oftabn lating `mechanism including stops onlthe frame and ,the carriage respectively which collide with each other to "arrest the carriage, a buffer which absorbs'the shock of ,such arrest, a rebound lock and connections between thesame andthe carriage which causes the lock to become operativefwhen the carriage is so arrested, and connections between the lock and the typewriter letter feed which causesl the release `of the lock when the typewriter letter feed returnsto normal' position.

' 13. The combination with a typewriting machine of tabulating mechanism includin stops,- of acarriage buffer, and meanswhic renders the typewriter letter feed inoperative during the actionv of the buffer, the` tabulating mechanismbeing meanwhile free to return to normal position. ,Y 14. The combination with a typewriting` machine having a typewriter feed of tabuf lator mechanism including stops, of a carriage buffer, and means which rendersthe typewriter feed automatically inoperative during vthe entire action of the buffer, the tabulating mechanism being free meanwhile to return tonormal position, the last mentioned means including a co-operating block and armfupon the stop rod and the typewriter feed respectively. n i

15. The combination with a typewriting machine of tabulator mechanism, a stop lbar yieldingly mounted upon the typewriter carriage, a stop on the stop bar, a stop on the frame, carriage brackets having channels, journal bearings adj ustably fitted within the channels and adapted to slidably receivethe'said yielding stop bar.

` 16. The combination with a; typewriting machine and feeding mechanismofutabulating mechanism including stopsto arrest the movement ofthe carria e,` a rebound lock, and means operative by he disengagement and engagement of -the feed .mecha` nism to permit operation of the rebound lock and to release said lock.

17. The combination With a typewriting machine of tabulating mechanism, a eari riage buffer, a rebound lock, and means operated by the movement of the typewriter letter feed in returning to normal operative position for unlocking the rebound lock.

18. The combination With a typewriting machine of tabulating mechanism, a carriage buffer, a rebound lock, and means operated by the move-ment of a part of the typewriter letter feed in returning to normal operative position for unlocking the` rebound lock.

In testimony whereof I affix my signature.

FRED P. GORIN. 

